Daria of Mesh Body Addicts blog has a video explaining Bento. It is great for the person that is just interested in knowing enough to understand what it is about and what the difference between the classic skeleton we have not and the new Bento Skeleton,
Daria promises to provide more information in a future animation.
The people working with mesh clothes will notice Daria’s ideas about collision bones is a bit off, not as precise as one would need for a tutorial. But, for a light weight explanation she is accurate.